Engine tapping sound

DRE68

MEMBER
2008 CHEVROLET TRAILBLAZER
6.0L
V8
AWD
AUTOMATIC
30,000 MILES

Engine starts to make a tapping sound when warmed up. The sound is slight at idle but when accelerating or increasing rpm it is more pronounced. Oil pressure is fine, no check engine lights or noticeable loss of power. Does not make a knocking sound like when I spin a rod hearing. You cannot hear it during start-up. Only at normal operational temperature. Appreciate your time and opinion.

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,356 POSTS

Hello,

It sounds like the oil is broken down and needs to be changed. Use Mobil1 for this change to see if that helps, here is a guide to help you get the problem fixed.

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

Please let us know what happens.

Cheers, Ken

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Wednesday, June 7th, 2017 AT 8:59 AM

DRE68

MEMBER
4 POSTS

I change oil every 3,000 miles with Mobil 1. Tapping sound continued after engine reached 210 after recent oil change. The sound comes once the engine reaches temp.

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Wednesday, June 7th, 2017 AT 10:19 AM

HMAC300

MECHANIC
48,601 POSTS

You really need to explain more if you can like is it top engine or more towards bottom may be cam/rocker wear or maybe piston slap.

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Wednesday, June 7th, 2017 AT 12:16 PM

DRE68

MEMBER
4 POSTS

Engine was rebuilt 5/2016. Due to ingesting water & breaking a rod. Ran fine until April of this year when the tapping started. The sound seems to be coming from the top passengers side. Loud tapping after warm-up. Never when started or cold.

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Wednesday, June 7th, 2017 AT 12:40 PM

HMAC300